30 CFR §56/57.3200Correction
of hazardous conditions
Ground conditions that create a hazard to persons shall be taken down or
supported before other work or travel is permitted in the affected area.Until corrective work is completed, the area
shall be posted with a warning against entry and, when left unattended, a
barrier shall be installed to impede unauthorized entry.

This standard requires that
hazardous ground conditions be taken down or supported before work or travel is
permitted in the affected area.Until
the hazardous conditions are corrected, the area must have a warning posted
against entry and, if unattended, a barrier must be installed to prevent
unauthorized entry into the area.

30 CFR § 77.1004Ground
control; inspection and maintenance; general.
(a) Highwalls, banks, benches, and terrain sloping into the working areas shall
be examined after every rain, freeze, or thaw before men work in such areas,
and such examination shall be made and recorded in accordance with §77.1713.

(b) Overhanging highwalls and
banks shall be taken down and other unsafe ground conditions shall be corrected
promptly, or the area shall be posted.

30 CFR § 75.202Protection
from falls of roof, face and ribs.
(a) The roof, face and ribs of areas where persons work or travel shall be
supported or otherwise controlled to protect persons from hazards related to
falls of the roof, face or ribs and coal or rock bursts.

(b) No person shall work or
travel under unsupported roof unless in accordance with this subpart.